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检索条件"机构=Science and Technology on Electromechanical Dynamic Control Laboratory"

共 511 条记录，以下是11-20 订阅

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Dual-functional Metamaterial Device controlled by a Singular Switch

Dual-functional Metamaterial Device Controlled by a Singular...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wen, Yongdiao Li, Gang Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9798350375909

Herein, a dual-functional terahertz (THz) metamaterial device is presented, the proposed device consists of two heteromorphic arrows, which can switch freely between absorption and polarization conversion controlled by a singular switch. The absorptivity peak (arounds 1.5 THz) and polarization conversion peak (arounds 2.8 THz) will be changed to polarization conversion peak and absorptivity peak with the state of the singular switch, the absorption function and the polarization conversion function can adjust and convert each other, and the maximum values of absorption rate and polarization conversion rate reach to 87.27% and 95.94% respectively. © 2024 IEEE.

关键词： Polarization

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Anti-jamming Method of FM Fuze Based on Deep Learning 4

Anti-jamming Method of FM Fuze Based on Deep Learning

引用

4th International Conference on Defence technology, ICDT 2024

作者： Zhang, Jin-Yu Yan, Xiao-Peng Hao, Xin-Hong Zhang, Jin-Cheng Science and Technology on Electromechanical Dynamic Control Laboratory China Beijing Institute of Technology China

In response to the challenges posed by sweeping jamming and Digital Radio Frequency Memory (DRFM) jamming in Frequency Modulation Continuous Wave (FMCW) fuzes, a jamming mitigation method based on deep learning method is proposed in this paper. Initially, the target beat frequency signal data affected by sweeping jamming and DRFM jamming is gathered and analysed using the Transformer method. A comparison is made between the classification and recognition outcomes of Transformer model and Support Vector Machine (SVM) methods to identify the optimal model. Subsequently, the feature information of the echo signal under interference is extracted using Empirical Mode Decomposition (EMD) decomposition, and the target features are reconstructed. Experimental results utilizing simulated data confirm that the proposed method achieves a classification accuracy of 92% and ensures that the fuze detonation distance remains within the pre-set 9 m range. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Support vector machines

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Research on detection performance of millimeter wave fuze under rainfall condition 4

Research on detection performance of millimeter wave fuze un...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Tong, Ao Zhang, Yao Pan, Liwen Pan, Xi Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

Aiming at the characteristics that the performance of millimeter wave fuze is easily affected by the natural environment, this paper studies the performance of millimeter wave fuze under rainfall conditions. By analyzing the theory of rain attenuation effect and backscattering effect, it is concluded that the rain attenuation effect reduces the received power of the signal, and the backscattering effect reduces the signal to interference plus noise ratio (SINR) of the receiving end. Based on this, the signal propagation path model under rainfall conditions is established. Finally, the variation of the maximum reliable detection range with signal wavelength and rainfall rate is simulated under different SINR requirements, and the variation of signal to noise ratio (SNR) and SINR with rainfall rate is compared under different distances. The simulation results show that both the rain attenuation effect and the backscattering effect lead to the decrease of the maximum reliable detection distance of millimeter wave fuze. With the increase of rainfall rate, the detection performance of millimeter wave fuze decreases, and the detection distance decreases by about 23.2 % under extreme conditions. The rain backscattering effect on millimeter wave fuze is higher than its attenuation effect, and the influence of rain backscattering effect on millimeter wave fuze increases with the increase of detection distance. When the detection distance increases from 15 m to 30 m, the difference between SNR and SINR at the receiving end of millimeter wave fuze increases by about 3 times. This study has important reference significance for the application of millimeter wave fuze in precision guided weapons. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Signal to noise ratio

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Design and Implementation of a Fuze Intermediate Frequency Echo Simulator System 4

Design and Implementation of a Fuze Intermediate Frequency E...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Guo, Yao He, Shuhuan Yu, Wenheng Pan, Xi Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

The fuse echo simulator plays a crucial role in fuse testing. This paper introduces a combined hardware and software solution for a fuze intermediate frequency (IF) echo simulation system. The system utilizes Direct Digital Synthesis (DDS) technology to generate controllable IF echo *** prestoring classic target and environmental characteristic information data, the system is capable of incorporating diverse target and environmental parameters during the simulation of projectile-target encounter process, thereby enhancing the fidelity of the simulated echo signals. Experimental simulations and engineering validations have confirmed that the proposed system can accurately simulate various characteristics of echo signals, while exhibiting low temporal complexity and high real-time performance. These attributes render it effective for evaluating the dynamic performance of Frequency Modulated Continuous Wave (FMCW) fuse systems. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Software testing

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A Design on Silicon-Based Millimeter-Wave Low Noise Amplifier Circuits 7

A Design on Silicon-Based Millimeter-Wave Low Noise Amplifie...

引用

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Xing, Zikang Liang, Qiuyan Xu, Rui Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

ISBN: (纸本)9798350384437

This paper investigates the technology of silicon-based millimeter-wave low noise amplifiers (LNA). The LNA consist of two stages of amplifiers connected in cascade. The first stage circuit achieves low noise performance by utilizing minimum noise input matching. The second stage achieves high gain performance by utilizing high gain output matching.. The LNA in this paper achieves a gain S21 of 16 dB at a center frequency of 36 GHz with a noise figure (NF) as small as 5 dB. © 2024 IEEE.

关键词： Low noise amplifiers

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Joint radar and communication based on piece-wised LFM signals 4

Joint radar and communication based on piece-wised LFM signa...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Wang, Xin Duu, Yingsen Zhang, Xiang Wu, Dan Zhang, Ke Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

Existing joint radar detection and communication(JDC] systems suffer from high peak-to-average power ratiofPAPR] or distance blind spot zones. In this paper, we present a novel JDC system based on piece-wised linear frequency modulation(LFM] signals. Based on the proposed piece-wised LFM modulation signal, the novel JDC system can achieve linear frequency modulation continuous wave(LFMCW) detection, and the PAPR and blind zone issues are solved. Besides, spread spectrum communication can be simultaneously conducted with the same modulation signal. Simulation results show that the proposed JDC system has similar detection performance to the traditional sawtooth LFMCW detection scheme, and the bit-error rate of communication is less than 10~6 when the the bit rate is 500kbps and the signal-to-noise ratio is 10 dB. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Frequency modulation

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Object Detection Based on Digital Twin-Based Road Scenarios 2

Object Detection Based on Digital Twin-Based Road Scenarios

引用

2nd IEEE International Conference on control, Electronics and Computer technology, ICCECT 2024

作者： Yu, Zhang Huimin, Chen Weihan, Wang Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing100081 China

ISBN: (纸本)9798350380958

With the rapid development of artificial intelligence and digital technology, digital twins are becoming more and more widely used in various fields, and have high application value in industrial production, architectural design and other fields. There are few datasets of extreme scenarios used in traditional object detection and vehicle autonomous driving training, resulting in unsatisfactory results of object detection and autonomous driving technology in complex environments. In this paper, a digital twin model of the road scene is built based on the rules of City Engine and the Unreal Engine 4 platform, which can be used to build a model of complex road scenes and shorten the model construction cycle. Based on the constructed digital twin model, the target detection task is carried out, and it is verified that the target detection and autonomous driving tests can be carried out in the digital twin model. It provides ideas for solving the problem of insufficient testing of autonomous driving and object detection tasks in complex and extreme scenarios. © 2024 IEEE.

关键词： Object detection

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A Tolerance Precision control Method Based on the Internal and External Double-layer Pressure Screw Limits 4

A Tolerance Precision Control Method Based on the Internal a...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Sun, Chengcheng Ma, Hongping Tian, Zhongwang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute on Electromechanical Information Technology Xi'an China

In order to solve the problem that the assembly axial clearance of large-diameter mechanical trigger fuze delay device is large in the fuze body, a tolerance precision control method based on the internal and external double-layer pressure screw limits is proposed. The internal and external double-layer screw threads constitute two sets of independent redundant dimensional chains in distribution direction and value. The final assembly accuracy of the delay device is adjusted by the internal and external double-layer pressure screw mutually. The minimum coaxiality deviation of assembly can achieve 0 deviation, and the average accuracy of assembly coaxiality is increased by about 30.69%, which has obvious effect in reducing axis eccentricity. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Screw threads

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Fuze dual-channel ballistic height fusion and prediction algorithm based on FCI-KF 4

Fuze dual-channel ballistic height fusion and prediction alg...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Wu, Dan Zhang, Ke Wang, Xin Xu, Ruichen Yang, Jingang Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

To improve the measurement accuracy of the ballistic height and anti-interference ability of fuze in complex environments, the fuze dual-channel ballistic height fusion and prediction algorithm based on Fast Covariance Intersection fusion Kalman Filter (FCI-KF) is proposed. Firstly, the state model and observation model are established, the improved Kalman Filter (KF) algorithm is used to predict the height of the single-channel and then the Fast Covariance Intersection (FCI) algorithm is used to fuse the dual-channel data. This algorithm does not need to calculate the cross-covariance matrix between channels, hence the amount of calculation is small, which is convenient for engineering realization. Finally, the algorithm is simulated and verified, the simulation results show that the measurement accuracy of the proposed algorithm can be significantly improved compared with the original measurement, and the measurement accuracy of the ballistic height is better than that of the traditional methods using only one channel, which verifies the effectiveness of the algorithm. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Kalman filters

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Wide Solid Angle Scanning Conical Conformal Phased Array Antenna Based on Bidirectional Beam 7

Wide Solid Angle Scanning Conical Conformal Phased Array Ant...

引用

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Liang, Qiuyan Xu, Rui Xing, Zikang Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

ISBN: (纸本)9798350384437

This paper presents a conical conformal antenna array with wide solid angle scanning range. The proposed antenna array employs two columns of conformal patch subarrays symmetrically distributed on the surface of a conical structure. With the symmetric structure, the antenna array can generate bidirectional beam to cover two symmetric azimuth sectors simultaneously. Given different phase distributions to the subarrays, the generated bidirectional beam exhibits different elevation angles, thus realizing scanning of the bidirectional beam with respect to the conical structure. Excited with four sets of phase difference, the proposed antenna array covers elevation range of -90° to -42° and 42° to 90° with 3dB beamwidth in azimuth plane of 138° to 170°. The conical conformal antenna array realizes wide solid angle scanning range with a simple structure, it is suitable for military detection and civil surveillance applications. © 2024 IEEE.

关键词： Scanning antennas

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